New! Sign up for our free email newsletter.
Science News
from research organizations

Faster, cheaper, nano-based manufacturing

Scalable and cost-effective manufacturing of thin film devices

Date:
February 14, 2018
Source:
Rutgers University
Summary:
Engineers are developing a new method of processing nanomaterials that could lead to faster and cheaper manufacturing of flexible thin film devices -- from touch screens to window coatings, according to a new study. The 'intense pulsed light sintering' method uses high-energy light over an area nearly 7,000 times larger than a laser to fuse nanomaterials in seconds.
Share:
FULL STORY

Engineers at Rutgers University-New Brunswick and Oregon State University are developing a new method of processing nanomaterials that could lead to faster and cheaper manufacturing of flexible thin film devices -- from touch screens to window coatings, according to a new study.

The "intense pulsed light sintering" method uses high-energy light over an area nearly 7,000 times larger than a laser to fuse nanomaterials in seconds. Nanomaterials are materials characterized by their tiny size, measured in nanometers. A nanometer is one millionth of a millimeter, or about 100,000 times smaller than the diameter of a human hair.

The existing method of pulsed light fusion uses temperatures of around 250 degrees Celsius (482 degrees Fahrenheit) to fuse silver nanospheres into structures that conduct electricity. But the new study, published in RSC Advances and led by Rutgers School of Engineering doctoral student Michael Dexter, showed that fusion at 150 degrees Celsius (302 degrees Fahrenheit) works well while retaining the conductivity of the fused silver nanomaterials.

The engineers' achievement started with silver nanomaterials of different shapes: long, thin rods called nanowires in addition to nanospheres. The sharp reduction in temperature needed for fusion makes it possible to use low-cost, temperature-sensitive plastic substrates like polyethylene terephthalate (PET) and polycarbonate in flexible devices, without damaging them.

"Pulsed light sintering of nanomaterials enables really fast manufacturing of flexible devices for economies of scale," said Rajiv Malhotra, the study's senior author and assistant professor in the Department of Mechanical and Aerospace Engineering at Rutgers-New Brunswick. "Our innovation extends this capability by allowing cheaper temperature-sensitive substrates to be used."

Fused silver nanomaterials are used to conduct electricity in devices such as radio-frequency identification (RFID) tags, display devices and solar cells. Flexible forms of these products rely on fusion of conductive nanomaterials on flexible substrates, or platforms, such as plastics and other polymers.

"The next step is to see whether other nanomaterial shapes, including flat flakes and triangles, will drive fusion temperatures even lower," Malhotra said.

In another study, published in Scientific Reports, the Rutgers and Oregon State engineers demonstrated pulsed light sintering of copper sulfide nanoparticles, a semiconductor, to make films less than 100 nanometers thick.

"We were able to perform this fusion in two to seven seconds compared with the minutes to hours it normally takes now," said Malhotra, the study's senior author. "We also showed how to use the pulsed light fusion process to control the electrical and optical properties of the film."

Their discovery could speed up the manufacturing of copper sulfide thin films used in window coatings that control solar infrared light, transistors and switches, according to the study. This work was funded by the National Science Foundation and The Walmart Manufacturing Innovation Foundation.


Story Source:

Materials provided by Rutgers University. Note: Content may be edited for style and length.


Journal Reference:

  1. M. Dexter, R. Bhandari, C-H. Chang, R. Malhotra. Controlling processing temperatures and self-limiting behaviour in intense pulsed sintering by tailoring nanomaterial shape distribution. RSC Advances, 2017; 7 (89): 56395 DOI: 10.1039/C7RA11013H

Cite This Page:

Rutgers University. "Faster, cheaper, nano-based manufacturing." ScienceDaily. ScienceDaily, 14 February 2018. <www.sciencedaily.com/releases/2018/02/180214093836.htm>.
Rutgers University. (2018, February 14). Faster, cheaper, nano-based manufacturing. ScienceDaily. Retrieved June 14, 2024 from www.sciencedaily.com/releases/2018/02/180214093836.htm
Rutgers University. "Faster, cheaper, nano-based manufacturing." ScienceDaily. www.sciencedaily.com/releases/2018/02/180214093836.htm (accessed June 14, 2024).

Explore More

from ScienceDaily

RELATED STORIES